{"id":13155,"date":"2022-10-03T04:44:15","date_gmt":"2022-10-02T23:14:15","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-replacing-a-character-in-a-c-string\/"},"modified":"2022-10-03T04:44:15","modified_gmt":"2022-10-02T23:14:15","slug":"solved-replacing-a-character-in-a-c-string","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-replacing-a-character-in-a-c-string\/","title":{"rendered":"[Solved] Replacing a character in a c string"},"content":{"rendered":"

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This code compiles cleanly using GCC 4.8.2 on Mac OS X 10.9.1 Mavericks with the command line:<\/p>\n

gcc -O3 -g -std=c11 -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes \\\n        -Wold-style-definition -Werror bits.c -o bits\n<\/code><\/pre>\n
Source:<\/p>\n
#include <math.h>\n#include <stdio.h>\n#include <string.h>\n\nextern int twosComplement(int number);\n\nint twosComplement(int number)\n{\n    printf(\"searching for twos complement of %d\\n\", number);\n    int temp = number * -1;\n    if (temp < -32768)\n        return 0;\n    printf(\"%d\\n\", temp);\n    char bits[17] = \"\";\n    int i;\n    int x = 0;\n    int y;\n    for (i = 15; i >= 0; i--)\n    {\n        y = pow(2, i);\n        if (temp % y != temp)\n        {\n            temp = temp % y;\n            strcat(bits, \"1\");\n        }\n        else\n        {\n            strcat(bits, \"0\");\n        }\n        printf(\"%s\\n\", bits);\n        x++;\n    }\n\n    printf(\"One's complement:\\n\");\n    for (x = 0; x < 16; x++)\n    {\n        if (bits[x] == '0')\n            bits[x] = '1';\n        else\n            bits[x] = '0';\n        printf(\"%s\\n\", bits);\n    }\n    return 0;\n}\n\nint main(void)\n{\n    twosComplement(23);\n    return 0;\n}\n<\/code><\/pre>\n
Output:<\/p>\n
searching for twos complement of 23\n-23\n0\n00\n000\n0000\n00000\n000000\n0000000\n00000000\n000000000\n0000000000\n00000000000\n000000000001\n0000000000010\n00000000000101\n000000000001011\n0000000000010111\nOne's complement:\n1000000000010111\n1100000000010111\n1110000000010111\n1111000000010111\n1111100000010111\n1111110000010111\n1111111000010111\n1111111100010111\n1111111110010111\n1111111111010111\n1111111111110111\n1111111111100111\n1111111111101111\n1111111111101011\n1111111111101001\n1111111111101000\n<\/code><\/pre>\n
You still have to implement the +1<\/code> part of two’s complement.<\/p>\n
Be wary of using strcat()<\/code> in a loop like this. It leads to quadratic runtime behaviour as strcat()<\/code> has to skip over the previous content before adding the new character, so it skips 0+1+2+3+4+…N-1 characters, which is N(N-1)\/2 bytes skipped in total.<\/p>\n<\/p><\/div>\n
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            4<\/span> <\/p><\/div>\n<\/div>\n
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solved Replacing a character in a c string <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] This code compiles cleanly using GCC 4.8.2 on Mac OS X 10.9.1 Mavericks with the command line: gcc -O3 -g -std=c11 -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes \\ -Wold-style-definition -Werror bits.c -o bits Source: #include <math.h> #include <stdio.h> #include <string.h> extern int twosComplement(int number); int twosComplement(int number) { printf(“searching for twos complement of %d\\n”, number); int … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[967,324,712],"class_list":["post-13155","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c-strings","tag-c","tag-pointers"],"yoast_head":"\n[Solved] Replacing a character in a c string - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-replacing-a-character-in-a-c-string\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Replacing a character in a c string - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] This code compiles cleanly using GCC 4.8.2 on Mac OS X 10.9.1 Mavericks with the command line: gcc -O3 -g -std=c11 -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes  -Wold-style-definition -Werror bits.c -o bits Source: #include <math.h> #include <stdio.h> #include <string.h> extern int twosComplement(int number); int twosComplement(int number) { printf("searching for twos complement of %dn", number); int ... 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